The most recent problem with my F5 build

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#22
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Tyer,

I think Rayma came up with a great idea.
Put the black lead of your meter on A. The measure the voltage with your red lead on C and D.
Repeat with your black lead on B.
What readings do you get?

Regards,
Dan
 

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#24
rayma said:
"I have 26 volts on both rails. 26 and -26."

Measure the power supply voltages by connecting the DVM black lead to the black speaker post
(for the channel you have an amplifier board installed for), and leave it there.

Do you still get both of the +/- power supply DC voltages correctly, measuring with the red DVM lead,
at the amp board? If not there is a wiring problem.

Did you use this to build it?
Firstwatt F5 amplifier v3 - diyAudio Guides
Click to expand...

I do get 26 volts at with DMV black lead connected to the black speaker post. I only have one amp board connected at this time.

I did use the V3 power supply guide.
 
#25
PS check.

dantwomey said:
Tyerkey,

I politely suggest we follow through with my previous post. If you like I'll post drawings and diagrams to help verify a key part of your amplifier is working as designed.

Regards,
Dan 🙂
Click to expand...

Yes please. I have time and will have my laptop home over the weekend which will help me access this thread and your advice more easily. I do agree that I need to assure the power supply is actually right. I do not know where to go other than what is in the build guide for trouble shooting. So any diagrams, drawings, or instructions will be very helpful and appreciated.

Thanks
 
#26
tyerkey said:
I do get 26 volts at with DMV black lead connected to the black speaker post. I only have one amp board connected at this time.

I did use the V3 power supply guide.
Click to expand...

The answer I'm looking for with one lead on the black speaker post is............

When the other lead is on C I get +26VDC. When I move the red lead to D I get -26VDC.

We have to get on the same page here so that you know a bipolar supply contains both a positive voltage and a negative voltage. Just saying I got 26 volts does not prove you have a properly working power supply.

More soon.

Regards,
Dan 🙂
 
#27
It's important to proceed in a logical, step by step manner when troubleshooting a problem.
Otherwise conclusions may be drawn that are not valid, and considerable effort may be wasted.
 
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#30
rayma said:
It's important to proceed in a logical, step by step manner when troubleshooting a problem.
Otherwise conclusions may be drawn that are not valid, and considerable effort may be wasted.
Click to expand...

I couldn't agree more. After it's verified that the PS is functioning correctly I have another suggestion I think is the next logical step. Since Tyer made a small initial error with Q1 and Q2 I'd would like to check Q3 and Q4, and Q5 and Q5 for part number and orientation.

Regards,
Dan 🙂
 
#32
So these all measure as expected? Is the audio board(s) still connected?

If so, repeat except measure with red DVM lead at the other ends of the PS wires, at the audio board
where they are soldered. Should have the same results.
 
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